Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses
Modeling tomographic measurements of photoelectron vortices in counter-rotating circularly polarized laser pulses
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DOI：
10.1103/physreva.100.063416
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发表时间：
2019-12-10
影响因子：
2.9
通讯作者：
van der Hart, H. W.
中科院分区：
文献类型：
--
作者：
Armstrong, G. S. J.;Clarke, D. D. A.;van der Hart, H. W.
近期实验[D. Pengel，S.克尔布施塔特湖Englert，T. Bayer和M. Wollenhaupt，Phys. Rev. A 96 043426（2017）]通过反向旋转圆偏振790 nm激光脉冲测量了钾的三光子电离的光电子动量分布。分布显示螺旋涡，所产生的电离波包与不同的磁量子数的干扰。在分布中观察到的高水平的多维细节使得这是一个理想的情况下，以证明适用于这些问题的新兴理论技术的准确性。我们使用R-矩阵与时间依赖的方法来研究这个过程。我们计算了全维光电子动量分布，并与以前在实验中测量的这种分布的一组平面投影进行比较。
Recent experiments [D. Pengel, S. Kerbstadt, L. Englert, T. Bayer, and M. Wollenhaupt, Phys. Rev. A 96 043426 (2017)] have measured the photoelectron momentum distribution for three-photon ionization of potassium by counter-rotating circularly polarized 790-nm laser pulses. The distribution displays spiral vortices, arising from the interference of ionizing wave packets with different magnetic quantum numbers. The high level of multidimensional detail observed in the distribution makes this an ideal case in which to demonstrate the accuracy of emerging theoretical techniques applicable to such problems. We use the R-matrix with time dependence approach to investigate this process. We calculate the full-dimensional photoelectron momentum distribution, and compare against a set of planar projections of this distribution previously measured in experiment.